action/drawable-anydpi-v21/ic_settings_brightness_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M21,3L3,3c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h18c1.1,0 2,-0.9 2,-2L23,5c0,-1.1 -0.9,-2 -2,-2zM21,19.01L3,19.01L3,4.99h18v14.02zM8,16h2.5l1.5,1.5 1.5,-1.5L16,16v-2.5l1.5,-1.5 -1.5,-1.5L16,8h-2.5L12,6.5 10.5,8L8,8v2.5L6.5,12 8,13.5L8,16zM12,9c1.66,0 3,1.34 3,3s-1.34,3 -3,3L12,9z"/>
</vector>